. >> reporter: tonight's cnn's anderson cooper revealed dorner had sent him a package. >> inside the package was a hand-labeled dvd with a yellow post-it note reading in part, "i never lie." apparently in reference to his dismissal from the lapd in 2008. >> reporter: there are indications he may have reason to be angry. i'm not an aspiring rapper. i'm not a gang member. i'm not a dope dealer, dorner writes in his manifesto. i am a man who has lost complete faith in the system when the system betrayed, slandered, and libelled me. the manic account of his firing given in that manifesto is told more soberfully court documents. in both, dorner claims the lapd fired him after he reported having witnessed his superior using a taser on a mentally ill suspect, then he said seeing the superior hand-cuff the suspect and kick him in the chest and face. the suspect, christopher gedler and his father offered testimony corroborating dorner's account at the time, but the father now says he wasn't surprised that the review board ended up rejecting dorner's claims. >> i even told him, what is wrong w